Quand dois-je mettre "a" ou "an" Bonjour, je souhaite à quel moment nous devons mettre "a" ou "an" en anglais ? Y a t-il une règle ?

Who would agree to help me ? I can help you

Hello, I am looking for someone to help me work in English and writing needs me with the vocabulary in the area where I work, in transport and logistics. I would also be happy to help you in the French language.